Add some DTTH notice

src/pages/welcome.jsx

@@ -38,7 +38,7 @@ function Welcome() {
             </b>
           </big>
         </p>
-        <p class="desc">A minimalistic opinionated Mastodon web client.</p>
+        <p class="desc">A minimalistic opinionated DTTHDon web client.</p>
       </div>
       <div id="why-container">
         <div class="sections">
@@ -99,8 +99,13 @@ function Welcome() {
       </div>
       <hr />
       <p>
+        <p>
+          <a href="https://git.dtth.ch/nki/phanpy" target="_blank">
+            DTTHDon Fork
+          </a>
+        </p>
         <a href="https://github.com/cheeaun/phanpy" target="_blank">
-          Built
+          Original built
         </a>{' '}
         by{' '}
         <a